what sections did you have a timing trouble on?
I honestly think cliffs/destroyer is NOT enough for bio. you're gonna want to find feralis' notes. Also, look up the ADA dat examinee guide for exactly what topics are covered and fill in the gaps by looking up wikipedia or youtube videos.
Chad's is gonna be more than enough for GC and OC. Some people have used only chads and scored 30 on both sections.
I'd recommend getting bootcamp based on how close the questions are to the actual dat.
I've heard people getting Qvault with bootcamp or as an alternative. I'd at least get one of these two.
It'd be pretty good to refer to people's breakdowns as well to get a general idea of what's worked for others.
This thread has a LOT of breakdowns/guides:
http://forums.studentdoctor.net/showthread.php?t=992975
Good luck!